CN107701320B - Method and system for estimating combustion state in cylinder of multi-cylinder engine - Google Patents
Method and system for estimating combustion state in cylinder of multi-cylinder engine Download PDFInfo
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- CN107701320B CN107701320B CN201710917442.6A CN201710917442A CN107701320B CN 107701320 B CN107701320 B CN 107701320B CN 201710917442 A CN201710917442 A CN 201710917442A CN 107701320 B CN107701320 B CN 107701320B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
- F02D35/024—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure using an estimation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention discloses a method for estimating the combustion state of a cylinder of a multi-cylinder engine, which comprises the steps of firstly obtaining the equivalent relation between an average indicated pressure index IMEP and a rotation speed index delta N of each cylinder through a bench test in an off-line state, then selecting any cylinder as a characteristic cylinder, arranging a cylinder pressure sensor in the cylinder, calculating the IMEP of the characteristic cylinder according to a received cylinder pressure signal, calculating the delta N of a non-characteristic cylinder according to a received crankshaft rotation speed signal, obtaining the IMEP of the non-characteristic cylinder through the equivalent relation between the IMEP and the delta N of the non-characteristic cylinder, and finally correcting the IMEP of the non-characteristic cylinder by adopting a PID algorithm by taking the IMEP of the characteristic cylinder as a target value. The design is simple in algorithm, is not limited by the number of engine cylinders, and has low requirements on crank angle accuracy.
Description
Technical Field
The invention belongs to the technical field of automobile engine control, and particularly relates to a method and a system for estimating the combustion state of a multi-cylinder engine cylinder, which are suitable for expanding the application range, simplifying the algorithm and reducing the precision requirement of crank angle.
Background
The in-cylinder pressure of the diesel engine directly reflects the working performance of the diesel engine, including the quality of the air inlet process, whether the oil injection timing is accurate, whether the air valve clearance is proper, the quality of the air tightness of the cylinder, the integrity degree of fuel combustion and the like. Therefore, the pressure signal can be measured to detect the working state of the diesel engine. For multi-cylinder engines, it is often necessary to use one cylinder pressure sensor per cylinder, which leads to an increase in cost.
Chinese patent: the invention patent with application publication number of CN104179573A and application publication number of 2014 and 12 month 3 discloses a method for estimating combustion state of a sub-cylinder of an internal combustion engine, which comprises the steps of setting a cylinder pressure sensor in any sub-cylinder of the internal combustion engine, setting a crankshaft rotating speed sensor on a crankshaft of the internal combustion engine, solving the sum of sub-cylinder indicating torques according to a crankshaft system rigid model of the internal combustion engine, decomposing the sum of indicating torques to obtain a gas acting force indicating torque of a current ignition cylinder, directly measuring the gas acting force indicating torque of the sub-cylinder provided with the cylinder pressure sensor by the cylinder pressure sensor, and making a difference between a measured value and the gas acting force indicating torque of the current ignition cylinder obtained in the last step to obtain an error of the gas acting force indicating torque of the sub-cylinder provided with the cylinder pressure sensor, and correcting a gas acting force indicating torque estimated value of the cylinder not provided with the cylinder pressure sensor when the cylinder is ignited. Although the system can feed back the combustion state parameters of multiple cylinders by only using one cylinder pressure sensor, the following defects still exist:
1. when the torque of the working stroke of the current cylinder is calculated, other cylinders are required to be exactly positioned in compression, exhaust and air intake strokes, so that the method is only suitable for a four-cylinder engine;
2. the whole calculation process has high precision requirement on crank angle, the adopted algorithm is complex, the calculated amount is large, and the real-time calculation has high calculation capability requirement on the controller.
Disclosure of Invention
The invention aims to solve the problems of high requirement on crank angle precision and complex algorithm of a four-cylinder engine, which are only applicable to the prior art, and provides a method and a system for estimating the combustion state of a multi-cylinder engine cylinder, which are not limited by the number of engine cylinders, low requirement on crank angle precision and simple algorithm.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the method for estimating the combustion state in the cylinder of the multi-cylinder engine sequentially comprises the following steps of:
1. under the off-line state, a cylinder pressure sensor is arranged in each cylinder of the engine, a crankshaft rotating speed sensor is arranged on a crankshaft of the engine, and then the equivalent relation between the average indicated pressure index IMEP and the rotating speed index delta N of each cylinder is obtained through bench test:
IMEP j ＝f(ΔN j )(j＝1，2，3...)
in IMSP j Is the average indicated pressure index of the jth cylinder, delta N j The rotation speed index of the jth cylinder;
2. firstly, selecting any cylinder of an engine as a characteristic cylinder, arranging a cylinder pressure sensor in the cylinder, arranging a crankshaft rotation speed sensor on a crankshaft of the engine, then under an on-line state, calculating IMEP of the characteristic cylinder according to a received cylinder pressure signal, calculating delta N of a non-characteristic cylinder according to a received crankshaft rotation speed signal, and obtaining the IMEP of the non-characteristic cylinder through the equivalent relation between the non-characteristic cylinder IMEP and the delta N obtained in the step one;
3. and (3) taking the IMEP of the characteristic cylinder as a target value, and adopting a PID algorithm to correct the IMEP of the non-characteristic cylinder so as to enable the IMEP of each cylinder to be consistent.
In the first and second steps, the rotation speed index Δn refers to the difference value of average rotation speeds in a certain angle range obtained by calculating the starting and stopping positions of the fixed crank angle respectively:
ΔN j ＝N jH -N jL (j＝1，2，3...)
wherein N is jH The average rotating speed of the high-speed section corresponding to the jth cylinder is N jL The average rotation speed of the low speed section corresponding to the j-th cylinder.
The certain angle range is 6-90 degrees.
In the first and second steps, the IMEP is calculated by the engine controller according to the following formula:
wherein, the working top dead center +180deg.CA is 180 deg.C crank angle after the working top dead center, the working top dead center +180deg.C is 180 deg.C crank angle before the working top dead center, P is the cylinder in-cylinder pressure, v is the cylinder volume, and Vs is the working volume of the cylinder.
An estimation system of the combustion state in a multi-cylinder engine cylinder comprises a cylinder pressure sensor positioned in any cylinder of the engine, namely a characteristic cylinder, a crankshaft rotation speed sensor positioned on a crankshaft of the engine and an engine controller;
the engine controller comprises a storage module, a data acquisition module, an IMEP calculation module and a PID correction module, wherein the input end of the data acquisition module is in signal connection with a cylinder pressure sensor and a crankshaft rotation speed sensor, the output ends of the storage module and the data acquisition module are in signal connection with the input end of the IMEP calculation module, and the output end of the IMEP calculation module is in signal connection with the input end of the PID correction module;
the storage module is used for storing the equivalent relation between the average indicated pressure index IMEP and the rotation speed index delta N of each cylinder measured by the bench test in an offline state, the IMEP calculation module is used for calculating the IMEP of the characteristic cylinder according to the collected cylinder pressure signals, calculating the delta N of the non-characteristic cylinder according to the collected crankshaft rotation speed signals, obtaining the IMEP of the non-characteristic cylinder through the equivalent relation in the storage module, and the PID correction module is used for correcting the IMEP of the non-characteristic cylinder by taking the IMEP of the characteristic cylinder as a target value and adopting a PID algorithm to make the IMEP of each cylinder consistent.
The rotation speed index delta N refers to the difference value of average rotation speeds in a certain angle range obtained by calculation at the starting and stopping positions of the fixed crank angle.
The certain angle range is 6-90 degrees.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a method and a system for estimating the combustion state in a cylinder of a multi-cylinder engine, which are characterized in that an equivalent relation between IMEP and delta N of each cylinder is firstly built off-line, then the IMEP of a characteristic cylinder is measured by a cylinder pressure sensor in an on-line state, delta N of a non-characteristic cylinder is measured by a crankshaft rotation speed sensor, the IMEP of the non-characteristic cylinder is obtained according to the equivalent relation, and then the IMEP of the non-characteristic cylinder is corrected by taking the IMEP of the characteristic cylinder as a target value and combining a PID algorithm. Therefore, the invention is simple in calculation and is not limited by the number of engine cylinders.
2. The invention relates to a method and a system for estimating the combustion state of a multi-cylinder engine cylinder, wherein a rotation speed index delta N refers to the difference value of average rotation speeds in a certain angle range, which is obtained by calculating the starting and stopping positions of a fixed crank angle, and the index is used as a standard for measuring the work of a current cylinder, so that the method and the system are scientific and reasonable, and the calculation of the index has lower precision requirements on the crank angle. Therefore, the invention has low requirements on the precision of the crank angle.
Drawings
Fig. 1 is a block diagram of the system of the present invention.
Fig. 2 is a schematic diagram of a rotation speed index in the present invention.
Fig. 3 is a block diagram of the PID algorithm of the present invention.
In the figure: the device comprises a cylinder pressure sensor 1, a crankshaft rotation speed sensor 2, an engine controller 3, a storage module 31, a data acquisition module 32, an IMEP calculation module 33 and a PID correction module 34.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Referring to fig. 1, a method for estimating the combustion state in a cylinder of a multi-cylinder engine sequentially comprises the following steps:
1. under the off-line state, a cylinder pressure sensor is arranged in each cylinder of the engine, a crankshaft rotating speed sensor is arranged on a crankshaft of the engine, and then the equivalent relation between the average indicated pressure index IMEP and the rotating speed index delta N of each cylinder is obtained through bench test:
IMEP j ＝f(ΔN j )(j＝1，2，3...)
in IMEP j Is the average indicated pressure index of the jth cylinder, delta N j The rotation speed index of the jth cylinder;
2. firstly, selecting any cylinder of an engine as a characteristic cylinder, arranging a cylinder pressure sensor 1 in the cylinder, arranging a crankshaft rotation speed sensor 2 on a crankshaft of the engine, then under an on-line state, calculating IMEP of the characteristic cylinder according to a received cylinder pressure signal, calculating delta N of a non-characteristic cylinder according to a received crankshaft rotation speed signal, and obtaining the IMEP of the non-characteristic cylinder through the equivalent relation between the non-characteristic cylinder IMEP and the delta N obtained in the step one;
3. and (3) taking the IMEP of the characteristic cylinder as a target value, and adopting a PID algorithm to correct the IMEP of the non-characteristic cylinder so as to enable the IMEP of each cylinder to be consistent.
In the first and second steps, the rotation speed index Δn refers to the difference value of average rotation speeds in a certain angle range obtained by calculating the starting and stopping positions of the fixed crank angle respectively:
ΔN j ＝N jH -N jL (j＝1，2，3...)
wherein N is jH The average rotating speed of the high-speed section corresponding to the jth cylinder is N jL The average rotation speed of the low speed section corresponding to the j-th cylinder.
The certain angle range is 6-90 degrees.
In the first and second steps, the IMEP is calculated by the engine controller according to the following formula:
wherein, the working top dead center +180° CA is the 180 DEG crank angle after the working top dead center, the working top dead center-180 DEG CA is the 180 DEG crank angle before the working top dead center, P is the cylinder in-cylinder pressure, v is the cylinder volume, and Vs is the working volume of the cylinder.
An estimation system of the combustion state in a multi-cylinder engine cylinder comprises a cylinder pressure sensor 1 positioned in any cylinder of the engine, namely a characteristic cylinder, a crankshaft rotation speed sensor 2 positioned on a crankshaft of the engine and an engine controller 3;
the engine controller 3 comprises a storage module 31, a data acquisition module 32, an IMEP calculation module 33 and a PID correction module 34, wherein the input end of the data acquisition module 32 is in signal connection with the cylinder pressure sensor 1 and the crankshaft rotation speed sensor 2, the output ends of the storage module 31 and the data acquisition module 32 are both in signal connection with the input end of the IMEP calculation module 33, and the output end of the IMEP calculation module 33 is in signal connection with the input end of the PID correction module 34;
the storage module 31 is configured to store an equivalent relationship between an average indicated pressure index IMEP and a rotation speed index Δn of each cylinder measured in the bench test in an offline state, the IMEP calculation module 33 is configured to calculate IMEP of a characteristic cylinder according to an acquired cylinder pressure signal, calculate Δn of a non-characteristic cylinder according to an acquired crankshaft rotation speed signal, and obtain IMEP of the non-characteristic cylinder through the equivalent relationship in the storage module 31, and the PID correction module 34 is configured to correct IMEP of the non-characteristic cylinder by using IMEP of the characteristic cylinder as a target value and adopting a PID algorithm to make IMEP of each cylinder consistent.
The rotation speed index delta N refers to the difference value of average rotation speeds in a certain angle range obtained by calculation at the starting and stopping positions of the fixed crank angle.
The certain angle range is 6-90 degrees.
The principle of the invention is explained as follows:
rotational speed index Δn: the invention calculates the average rotating speed in a certain angle range at the start-stop position of the fixed crank angle based on the crank rotating speed sensor 2, each cylinder corresponds to two average rotating speeds, and the difference value of the two rotating speeds, namely the rotating speed index, is used as an index for measuring the work of the current cylinder.
Example 1:
referring to fig. 1, a method for estimating the in-cylinder combustion state of a six-cylinder engine sequentially adopts the following steps:
1. in an offline state, a cylinder pressure sensor is firstly arranged in each cylinder of an engine, a crankshaft rotating speed sensor is arranged on a crankshaft of the engine, then an engine controller 3 calculates an average indicated pressure index IMEP of each cylinder according to a received cylinder pressure signal, calculates a rotating speed index delta N of each cylinder according to a received crankshaft rotating speed signal, and establishes an equivalent relation between IMEP and delta N by using MAP, wherein the rotating speed index delta N refers to a difference value of average rotating speeds within 30 degrees calculated at a fixed crankshaft rotating angle starting position and a fixed crankshaft rotating position respectively (see figure 2):
IMEP j ＝f(ΔN j )(j＝1，2，3，4，5，6)
ΔN j ＝N jH -N jL (j＝1，2，3，4，5，6)
wherein, the acting top dead center-180 DEG CA is 180 DEG crank angle after the acting top dead center, the acting top dead center-180 DEG CA is 180 DEG crank angle before the acting top dead center, P is the cylinder in-cylinder pressure, V is the cylinder volume, V s IMEP is the working volume of the cylinder j Is the average indicated pressure index of the jth cylinder, delta N j Is the rotation speed index of the jth cylinder, N jH The average rotating speed of the high-speed section corresponding to the jth cylinder is N jL The average rotating speed of the low-speed section corresponding to the jth cylinder;
2. firstly, selecting any cylinder of an engine as a characteristic cylinder, arranging a cylinder pressure sensor 1 in the cylinder, arranging a crankshaft rotation speed sensor 2 on a crankshaft of the engine, then under an on-line state, calculating IMEP of the characteristic cylinder according to a received cylinder pressure signal, calculating delta N of a non-characteristic cylinder according to a received crankshaft rotation speed signal, and obtaining the IMEP of the non-characteristic cylinder according to the equivalent relation between the non-characteristic cylinder IMEP and the delta N obtained in the step one;
3. referring to fig. 3, the IMEP of the non-characteristic cylinders is corrected by a PID algorithm with the IMEP of the characteristic cylinder as a target value, so that the IMEP of each cylinder is consistent.
Referring to fig. 1, an estimation system of the in-cylinder combustion state of a multi-cylinder engine comprises a cylinder pressure sensor 1 positioned in any cylinder of the engine, namely a characteristic cylinder, a crankshaft rotation speed sensor 2 positioned on the crankshaft of the engine, and an engine controller 3, wherein the engine controller 3 comprises a storage module 31, a data acquisition module 32, an IMEP calculation module 33 and a PID correction module 34, the input end of the data acquisition module 32 is in signal connection with the cylinder pressure sensor 1 and the crankshaft rotation speed sensor 2, the output ends of the storage module 31 and the data acquisition module 32 are in signal connection with the input end of the IMEP calculation module 33, the output end of the IMEP calculation module 33 is in signal connection with the input end of the PID correction module 34, the storage module 31 is used for storing the equivalent relation between the average indicated pressure index IMEP and the rotation speed index delta N of each cylinder measured by a bench test in an off-line state, the IMEP calculation module 33 is used for calculating the IMEP of the characteristic cylinder according to the acquired cylinder pressure signal, calculating delta N of the non-characteristic cylinder according to the acquired crankshaft rotation speed signal, and obtaining the equivalent relation in the storage module 31 to obtain the non-characteristic cylinder rotation speed index delta value, and the calculated by the calculated value of the IMEP is equal to the average rotation speed index delta value of each cylinder in the cylinders in the off-line state, and the calculated value is equal to the calculated by the PID index delta value of the rotation speed of the cylinders in the rotation speed.
Claims (4)
1. A method for estimating combustion state in a cylinder of a multi-cylinder engine is characterized by comprising the following steps of:
the estimation method sequentially comprises the following steps:
1. under the off-line state, a cylinder pressure sensor is arranged in each cylinder of the engine, a crankshaft rotating speed sensor is arranged on a crankshaft of the engine, and then the equivalent relation between the average indicated pressure index IMEP and the rotating speed index delta N of each cylinder is obtained through bench test:
IMEP j ＝f(ΔN j )(j＝1，2，3...)
in IMEP j Is the average indicated pressure index of the jth cylinder, delta N j The rotation speed index of the jth cylinder;
2. firstly, selecting any cylinder of an engine as a characteristic cylinder, arranging a cylinder pressure sensor (1) in the cylinder pressure sensor, arranging a crankshaft rotating speed sensor (2) on a crankshaft of the engine, then in an on-line state, calculating IMEP of the characteristic cylinder according to a received cylinder pressure signal, calculating delta N of a non-characteristic cylinder according to a received crankshaft rotating speed signal, and obtaining the IMEP of the non-characteristic cylinder through the equivalent relation between the non-characteristic cylinder IMEP and the delta N obtained in the step one;
3. and (3) taking the IMEP of the characteristic cylinder as a target value, and adopting a PID algorithm to correct the IMEP of the non-characteristic cylinder so as to enable the IMEP of each cylinder to be consistent.
2. The method for estimating an in-cylinder combustion state of a multi-cylinder engine according to claim 1, characterized by:
in the first and second steps, the rotation speed index Δn refers to the difference value of average rotation speeds in a certain angle range obtained by calculating the starting and stopping positions of the fixed crank angle respectively:
ΔN j ＝N jH -N jL (j＝1，2，3...)
wherein N is jH The average rotating speed of the high-speed section corresponding to the jth cylinder is N jL The average rotation speed of the low speed section corresponding to the j-th cylinder.
3. The method for estimating an in-cylinder combustion state of a multi-cylinder engine according to claim 2, characterized by:
the certain angle range is 6-90 degrees.
4. The method for estimating an in-cylinder combustion state of a multi-cylinder engine according to claim 1, characterized by:
in the first and second steps, the IMEP is calculated by the engine controller (3) according to the following formula:
wherein, the working top dead center +180° CA is 180 DEG crank angle after the working top dead center, the working top dead center-180 DEG CA is 180 DEG crank angle before the working top dead center, P is the pressure in the cylinder, V is the volume of the cylinder, V s Is the working volume of the cylinder.
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| EP1321655A1 (en) * | 2001-12-21 | 2003-06-25 | Ford Global Technologies, Inc., A subsidiary of Ford Motor Company | Method for sensing and controlling the ignition point in an internal combustion engine |
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